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Olympic cyclists fill their tires with helium to make them lighter.
Calculate the mass of air in an air-filled tire and the mass of
helium in a helium-filled tire. Assume that the volume of the tire is 855 mL,
that it is filled to a total pressure of 125 psi, and that the temperature
is 25 °C. Also, assume an average molar mass for air of
28.8 g>mol. Calculate the mass of helium in a helium-filled tire.